Screw-conveyer



(No Model.)

F. C. CALDWELL.

.n W MM UNITED STATESA PATENT OFFICE.

FRANK C. CALDWELL, OF CHICAGO, u ILLINOIS.

.SCREW-CONVEYER.

SPECIFICATION forming part of Letters Patent No. 295,731, dated'March 25, 1884. A

Application lcd September 4,1883. (No model.) i

To all whom t may concern:

Be it known that I, FRANK G. CALDWELL, of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Screw-Conveyers, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of thisspeciication, and in whichy YFigure l is an elevation, and Fig. 2 a longitudnal section.

My invention is more especially intended for use on our-conveyers, but may be used Vfor other purposes to which it may be suited.

My invention relates to the iiights of screwconveyers; and it consists in making them of a multiple or plurality-of veneers, properly formed and cementedor secured together and to the shaft, as more fully described hereinafter.

Referring to the drawings, A represents the shaft of the conveyer7 and B the nights. I prefer to use the hollow shaft shown and described in various patents granted to Henry W. Caldwell, and have shown the same, but do not confine myself to any form or shape of shafting. The flights B consist of a plurality of veneers, preferably placed so that the grain of the different layers will be crossed. I have shown three layers;` but -any desired number may be used and of any desired thickness each. They are secured together by suitable cement or other means, and the preferred manner of shaping them would be to place I once, as set forth and claimed in one of the patents granted to the said Henry W. Cald` well) secured togetherand the whole secured to the shaft by any desirable form of fastening, as at.G,`Fig. l.

A convey'enightthus formed is rigid, light, cheap, and sufficiently durable for dry purposes, such as flour, Src.

l claim as my invention l; A conveyer-flight formed of a plurality of veneers, as set forth.

2. A conveyer-ight formed of a plurality of veneers secured together and to the shaft, substantially as set forth.

3. In a conveyer, the combination of the shaft and the continuous flight, the latter being formed of a plurality of veneers, which are secured together and to the shaft, substantially as shown and described.

i FRANK C. CALDWELL. In presence of- GEO. WV. SIcKELs, J ULIUs H. SMITH. 

